package string;

public class StringAndStringBuilder {
    public static void main(String[] args) {
       /*
        String str = "a";
        for (int i=0;i<1000000;i++){
            str = str +"a";
        }
        System.out.println("执行完毕");
        */

        StringBuilder builder = new StringBuilder("a");
        for (int i=0;i<1000000;i++){//100万次
            builder.append("a");
        }
        System.out.println("执行完毕");
    }
}
